Rules: Place a digit from 1-9 into each cell such that all digits appear in every row, column, and thickly outlined 3x3 region. Black clues outside the grid are X-Sums clues. They indicate the sum of the first X clues in that row or column (reading from the clue across), where X is the digit placed in the cell adjacent to the clue and counts towards the sum. Blue clues outside the grid are Sandwich clues. They indicate the sum of the digits located between the 1 and 9 in that row or column, not including the 1 or 9.
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